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arXiv 1005.3018astro-ph.EPastro-ph.COastro-ph.GA
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Herschel ATLAS中碎片盘的搜寻

A search for debris disks in the Herschel ATLAS

M. A. Thompson, D. J. B. Smith, J. A. Stevens, M. J. Jarvis, E. Vidal Perez, J. Marshall, L. Dunne, S. Eales, G. J. White, L. Leeuw, B. Sibthorpe, M. Baes, E. G… 展开作者

M. A. Thompson, D. J. B. Smith, J. A. Stevens, M. J. Jarvis, E. Vidal Perez, J. Marshall, L. Dunne, S. Eales, G. J. White, L. Leeuw, B. Sibthorpe, M. Baes, E. Gonzalez-Solares, D. Scott, J. Vieiria, A. Amblard, R. Auld, D. G. Bonfield, D. Burgarella, S. Buttiglione, A. Cava, D. L. Clements, A. Cooray, A. Dariush, G. de Zotti, S. Dye, S. Eales, D. Frayer, J. Fritz, J. Gonzalez-Nuevo, D. Herranz, E. Ibar, R. J. Ivison, G. Lagache, M. Lopez-Caniego, S. Maddox, M. Negrello, E. Pascale, M. Pohlen, E. Rigby, G. Rodighiero, S. Samui, S. Serjeant, P. Temi, I. Valtchanov, A. Verma

摘要:

目的:我们的目标是证明赫歇尔ATLAS(H-ATLAS)是适合于一个盲目的和公正的调查碎片盘通过识别候选碎片盘与主序星在调查的初始科学示范领域。我们发现,H-ATLAS揭示了一个人口的远红外/亚毫米源,与恒星或恒星状物体的SDSS主序星轨迹。我们验证我们的方法,通过比较最有可能的候选磁盘的已知人口的属性。研究方法:我们使用光度选择技术来识别SDSS DR 7星表中的主序星,并使用贝叶斯似然比方法来识别与这些主序星相关的H-ATLAS星表源。在这种光度选择之后,我们应用距离切割来确定最有可能的候选碎片盘,并使用UKIDSS LAS K波段图像排除污染星系的存在。结果如下:我们确定了78个H-ATLAS源与SDSS点源的主序列轨迹,其中两个是最有可能的碎片盘候选人:H-ATLAS J090315.8和H-ATLAS J090240.2。我们表明,他们是合理的候选人,通过比较其属性的碎片磁盘的已知人口。我们的初步结果表明,明亮的碎片盘是罕见的,在851颗恒星的搜索样本中只有2个候选者。我们还表明,H-ATLAS可以得出有用的上限与依巴谷星在外地的碎片盘,并概述了我们的碎片盘搜索方案的未来前景。

英文摘要:

Aims: We aim to demonstrate that the Herschel ATLAS (H-ATLAS) is suitable for a blind and unbiased survey for debris disks by identifying candidate debris disks associated with main sequence stars in the initial science demonstration field of the survey. We show that H-ATLAS reveals a population of far-infrared/sub-mm sources that are associated with stars or star-like objects on the SDSS main-sequence locus. We validate our approach by comparing the properties of the most likely candidate disks to those of the known population. Methods: We use a photometric selection technique to identify main sequence stars in the SDSS DR7 catalogue and a Bayesian Likelihood Ratio method to identify H-ATLAS catalogue sources associated with these main sequence stars. Following this photometric selection we apply distance cuts to identify the most likely candidate debris disks and rule out the presence of contaminating galaxies using UKIDSS LAS K-band images. Results: We identify 78 H-ATLAS sources associated with SDSS point sources on the main-sequence locus, of which two are the most likely debris disk candidates: H-ATLAS J090315.8 and H-ATLAS J090240.2. We show that they are plausible candidates by comparing their properties to the known population of debris disks. Our initial results indicate that bright debris disks are rare, with only 2 candidates identified in a search sample of 851 stars. We also show that H-ATLAS can derive useful upper limits for debris disks associated with Hipparcos stars in the field and outline the future prospects for our debris disk search programme.

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